Ejection System

Ejection System: The ejection system in a mould should be:

1.Positive in action

2.No ejection mark will be seen on the product

3. No defects on the product (I.e distortion, flash, witness mark)

Type of ejection for a particular product will depends on:

1. The configuration of the product

Types of ejection:

1. Pin ejection ( Round Pin, D-Pin )

2. Blade ejection

3. Stripper ejection ( Stripper plate, Stripper Ring )

4. Sleeve ejection

5. Air ejection ( Valve ejection )

The force required to eject the moulding will depends on:

1. The area of contact between the plastics and steel material

2. Co-efficient of friction between the plastics and steel material

3. Elastic modulus of steel material

4. Poissons ratio of the plastic material

5. The thermal contraction of the plastic material.